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EEVblog #801 – How To Design A Digital Clock

EEVblog #801 – How To Design A Digital Clock

The next step for Ahmed Mohamed How to design your own digital clock from 4000 ...

  • Worf

    Actually, camera sensors are VERY sensitive to IR. So much so that they usually have to put on an IR blocking filter in the light path to prevent IR from screwing up the image.

    This filter doesn’t render the sensor completely IR blocking, but it attenuates the IR significantly.

  • moose

    “regular” paper will glow blue under UV, banknote paper wont, the same with the IR ( the inks are very specific to banknotes)

  • Jason

    Soon we will new US bills in circulation (Oct 8) with more security features (ie 3D security ribbon). $1 are only bills left without any changes over the last 10 years. Too bad that you only have $5 bills to test.

  • Fred Lotte

    The angled sensors are probably looking at reflected light.